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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a753cefd7f19e7fbacc41cfb14d59d732730d832ac07def202fb6ae6f840e2' 
  AND token = 'QNrQFPV7qpIPK5TVThOaaCsZFhWFwE3XaVb5Qjh8T2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}